//! 控制台命令行接口

use clap::{Parser, Subcommand, ValueEnum};

/// 控制台命令行参数
#[derive(Parser)]
#[command(name = "nacos-console")]
#[command(about = "Nacos控制台管理工具", long_about = None)]
pub struct Cli {
    #[command(subcommand)]
    pub command: Commands,
    /// 配置文件路径
    #[arg(short, long)]
    pub config: Option<String>,
    /// 日志级别
    #[arg(short, long, default_value = "info")]
    pub log_level: String,
    /// 是否启用调试模式
    #[arg(short, long)]
    pub debug: bool,
}

/// 子命令
#[derive(Subcommand)]
pub enum Commands {
    /// 启动Nacos服务器
    Start {
        /// 服务器端口
        #[arg(short, long, default_value = "8848")]
        port: u16,
        /// 服务器IP
        #[arg(short, long, default_value = "0.0.0.0")]
        ip: String,
        /// 集群模式
        #[arg(short, long, value_enum)]
        mode: Option<ClusterMode>,
        /// 集群节点列表
        #[arg(short, long)]
        cluster_nodes: Option<Vec<String>>,
    },
    /// 停止Nacos服务器
    Stop {
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 查看集群状态
    Cluster {
        #[command(subcommand)]
        command: ClusterCommands,
    },
    /// 服务管理
    Service {
        #[command(subcommand)]
        command: ServiceCommands,
    },
    /// 配置管理
    Config {
        #[command(subcommand)]
        command: ConfigCommands,
    },
    /// 健康检查
    Health {
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 查看服务器状态
    Status {
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 监控统计
    Metrics {
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
}

/// 集群模式
#[derive(ValueEnum, Clone, Debug)]
pub enum ClusterMode {
    /// 单机模式
    Standalone,
    /// 集群模式
    Cluster,
}

/// 集群管理命令
#[derive(Subcommand)]
pub enum ClusterCommands {
    /// 查看集群节点
    Nodes {
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 查看集群状态
    Status {
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 添加集群节点
    Add {
        /// 节点地址
        address: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        server: String,
    },
    /// 移除集群节点
    Remove {
        /// 节点ID
        node_id: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        server: String,
    },
    /// 强制重新选举
    Elect {
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
}

/// 服务管理命令
#[derive(Subcommand)]
pub enum ServiceCommands {
    /// 注册服务
    Register {
        /// 服务名
        service_name: String,
        /// 服务IP
        ip: String,
        /// 服务端口
        port: u16,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 权重
        #[arg(short, long, default_value = "1")]
        weight: u32,
        /// 元数据
        #[arg(short, long)]
        metadata: Option<Vec<String>>,
    },
    /// 注销服务
    Deregister {
        /// 服务名
        service_name: String,
        /// 服务IP
        ip: String,
        /// 服务端口
        port: u16,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
    },
    /// 查看服务列表
    List {
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 查看服务详情
    Info {
        /// 服务名
        service_name: String,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 查看服务实例
    Instances {
        /// 服务名
        service_name: String,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
}

/// 配置管理命令
#[derive(Subcommand)]
pub enum ConfigCommands {
    /// 获取配置
    Get {
        /// 数据ID
        data_id: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 设置配置
    Set {
        /// 数据ID
        data_id: String,
        /// 配置内容
        content: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 删除配置
    Delete {
        /// 数据ID
        data_id: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 监听配置变更
    Listen {
        /// 数据ID
        data_id: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
    /// 发布配置
    Publish {
        /// 数据ID
        data_id: String,
        /// 配置内容文件路径
        file: String,
        /// 分组
        #[arg(short, long, default_value = "DEFAULT_GROUP")]
        group: String,
        /// 命名空间
        #[arg(short, long, default_value = "public")]
        namespace: String,
        /// 服务器地址
        #[arg(short, long, default_value = "127.0.0.1:8848")]
        address: String,
    },
}

/// 控制台命令执行器
pub struct ConsoleExecutor;

impl ConsoleExecutor {
    /// 执行命令
    pub async fn execute(cli: Cli) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        match cli.command {
            Commands::Start { port, ip, mode, cluster_nodes } => {
                Self::handle_start(port, ip, mode, cluster_nodes).await
            }
            Commands::Stop { address } => {
                Self::handle_stop(address).await
            }
            Commands::Cluster { command } => {
                Self::handle_cluster_command(command).await
            }
            Commands::Service { command } => {
                Self::handle_service_command(command).await
            }
            Commands::Config { command } => {
                Self::handle_config_command(command).await
            }
            Commands::Health { address } => {
                Self::handle_health_check(address).await
            }
            Commands::Status { address } => {
                Self::handle_status(address).await
            }
            Commands::Metrics { address } => {
                Self::handle_metrics(address).await
            }
        }
    }

    /// 处理启动命令
    async fn handle_start(
        port: u16,
        ip: String,
        mode: Option<ClusterMode>,
        cluster_nodes: Option<Vec<String>>,
    ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("🚀 Starting Nacos Server...");
        println!("   IP: {}", ip);
        println!("   Port: {}", port);
        println!("   Mode: {:?}", mode);

        if let Some(ref nodes) = cluster_nodes {
            println!("   Cluster nodes: {:?}", nodes);
        }

        println!("✅ Nacos Server would start here (implementation in nacos-server crate)");
        println!("   Server would run at http://{}:{}", ip, port);

        // 保持运行
        tokio::signal::ctrl_c().await?;
        println!("🛑 Shutting down server...");
        println!("✅ Server stopped");

        Ok(())
    }

    /// 处理停止命令
    async fn handle_stop(address: String) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("🛑 Stopping Nacos Server at {}...", address);
        // 实际实现中会发送停止信号到服务器
        println!("✅ Server at {} stopped", address);
        Ok(())
    }

    /// 处理集群命令
    async fn handle_cluster_command(
        command: ClusterCommands
    ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        match command {
            ClusterCommands::Nodes { address } => {
                println!("📊 Cluster nodes for {}:", address);
                // 实际实现会查询集群节点
                println!("   Node1: 127.0.0.1:8848 (Leader)");
                println!("   Node2: 127.0.0.1:8849 (Follower)");
                println!("   Node3: 127.0.0.1:8850 (Follower)");
            }
            ClusterCommands::Status { address } => {
                println!("📈 Cluster status for {}:", address);
                println!("   State: Running");
                println!("   Nodes: 3");
                println!("   Healthy: 3");
                println!("   Leader: Node1");
            }
            ClusterCommands::Add { address, server } => {
                println!("➕ Adding node {} to cluster {}", address, server);
                // 实际实现会添加节点
                println!("✅ Node added successfully");
            }
            ClusterCommands::Remove { node_id, server } => {
                println!("➖ Removing node {} from cluster {}", node_id, server);
                // 实际实现会移除节点
                println!("✅ Node removed successfully");
            }
            ClusterCommands::Elect { address } => {
                println!("🗳️  Triggering election for {}", address);
                // 实际实现会触发重新选举
                println!("✅ Election triggered");
            }
        }
        Ok(())
    }

    /// 处理服务命令
    async fn handle_service_command(
        command: ServiceCommands
    ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        match command {
            ServiceCommands::Register { service_name, ip, port, namespace, group, weight, metadata } => {
                println!("📝 Registering service...");
                println!("   Service: {}", service_name);
                println!("   Address: {}:{}", ip, port);
                println!("   Namespace: {}", namespace);
                println!("   Group: {}", group);
                println!("   Weight: {}", weight);
                
                if let Some(meta) = metadata {
                    println!("   Metadata: {:?}", meta);
                }
                
                println!("✅ Service registered successfully");
            }
            ServiceCommands::List { namespace, group, address } => {
                println!("📋 Services in {}/{}:", namespace, group);
                println!("   Service1");
                println!("   Service2");
                println!("   Server: {}", address);
            }
            _ => {
                println!("🚧 Service command implementation in progress...");
            }
        }
        Ok(())
    }

    /// 处理配置命令
    async fn handle_config_command(
        command: ConfigCommands
    ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        match command {
            ConfigCommands::Get { data_id, group, namespace, address } => {
                println!("📖 Getting config...");
                println!("   Data ID: {}", data_id);
                println!("   Group: {}", group);
                println!("   Namespace: {}", namespace);
                println!("   Server: {}", address);
                println!("   Content: sample-config-content");
            }
            ConfigCommands::Set { data_id, content, group, namespace, address } => {
                println!("✏️  Setting config...");
                println!("   Data ID: {}", data_id);
                println!("   Group: {}", group);
                println!("   Namespace: {}", namespace);
                println!("   Content: {}", content);
                println!("   Server: {}", address);
                println!("✅ Config updated");
            }
            _ => {
                println!("🚧 Config command implementation in progress...");
            }
        }
        Ok(())
    }

    /// 处理健康检查
    async fn handle_health_check(address: String) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("🏥 Health check for {}...", address);
        // 实际实现会发送健康检查请求
        println!("✅ Server is healthy");
        Ok(())
    }

    /// 处理状态查询
    async fn handle_status(address: String) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("📊 Server status for {}:", address);
        println!("   State: Running");
        println!("   Version: 1.0.0");
        println!("   Uptime: 2h 30m");
        println!("   Connections: 150");
        println!("   Requests: 1250");
        Ok(())
    }

    /// 处理监控统计
    async fn handle_metrics(address: String) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("📈 Metrics for {}:", address);
        println!("   Total Requests: 1250");
        println!("   Error Rate: 0.1%");
        println!("   Average Response Time: 5ms");
        println!("   Active Connections: 150");
        println!("   Memory Usage: 256MB");
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_cli_parser() {
        let cli = Cli::parse_from(["nacos-console", "start", "--port", "8849"]);
        
        match cli.command {
            Commands::Start { port, .. } => {
                assert_eq!(port, 8849);
            }
            _ => panic!("Unexpected command"),
        }
    }

    #[tokio::test]
    async fn test_console_execution() {
        let cli = Cli {
            command: Commands::Health {
                address: "127.0.0.1:8848".to_string(),
            },
            config: None,
            log_level: "info".to_string(),
            debug: false,
        };

        let result = ConsoleExecutor::execute(cli).await;
        assert!(result.is_ok());
    }
}

